EP 0886943 B1 20050209 - A METHOD AND APPARATUS FOR IMPROVED PHASE SHIFT KEYED (PSK) SIGNAL DEMODULATION
Title (en)
A METHOD AND APPARATUS FOR IMPROVED PHASE SHIFT KEYED (PSK) SIGNAL DEMODULATION
Title (de)
VERFAHREN UND EINRICHTUNG ZUR VERBESSERTEN DEMODULATION VON PHASENSPRUNGSIGNALEN
Title (fr)
METHODE ET DISPOSITIF DE DEMODULATION DE SIGNAUX PAR DEPLACEMENT DE PHASE AMELIOREE
Publication
Application
Priority
- IB 9701514 W 19971204
- US 76264296 A 19961209
Abstract (en)
[origin: US5764707A] An improved method for signal demodulation, based upon the assessment of an error statistic which is independent of the content of the data stream. To determine the appropriate sampling point within a data period, multiple sampling points are utilized to generate a set of alternative decodings of the data stream. Associated with each of these alternative sets is an error statistic which is computed based upon a known characteristic of the transmitted stream. For example, in Differential QPSK, the encoded phase change is known to be a multiple of 90 degrees. The error statistic would be a function of the difference between each sampled phase and the nearest multiple of 90 degrees. This error statistic provides a quantifiable measure of quality and noise margin associated with each sampling point. The decoded stream associated with the error statistic of highest quality is then selected as the proper decoding of the transmitted data stream. This invention is particularly well suited for processing small data packets, such as ATM.
IPC 1-7
IPC 8 full level
H04L 27/22 (2006.01); H04L 7/033 (2006.01); H04L 27/233 (2006.01)
CPC (source: EP KR US)
H04L 7/0334 (2013.01 - EP US); H04L 27/22 (2013.01 - KR); H04L 27/2338 (2013.01 - EP US); H04L 7/0337 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
US 5764707 A 19980609; DE 69732482 D1 20050317; DE 69732482 T2 20060105; EP 0886943 A2 19981230; EP 0886943 B1 20050209; JP 2000505974 A 20000516; KR 100484554 B1 20050831; KR 19990082550 A 19991125; WO 9826545 A2 19980618; WO 9826545 A3 19980813
DOCDB simple family (application)
US 76264296 A 19961209; DE 69732482 T 19971204; EP 97913365 A 19971204; IB 9701514 W 19971204; JP 52641598 A 19971204; KR 19980706288 A 19980808